i know that feeling ! even though i´m a mediocre jumper one of the things i found out it helps imo, is taking a break, it worked with me, stop jumping for like a week or more and then comeback, can´t make a jump ? practice a bit and if u can´t do it just go to other map, and return to that jump the next day and practice on it a little more, don´t spend countless hours stuck on the same jump
i used to go on chillout too and record the pros jumping with skeys and rewatch the demos a bit slow down with host_timescale, watching adrian cheat through the maps like that is amazing
also jumping offline it helped me a bit too, no disctractions, no people spamming in chat or pm´ing you every minute, better to concentrate
just keep practicing and have fun
just my 2 cents